Improvement in hoisting apparatus



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` IMPROVEMENT vIN IIoIsTL'Ne APPARATUS.`

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'Be it known that I, WILLIAM Rune, of the city, county, and State of NewYork, have inventeda new and improved Hoisting Apparatus; and I dohereby declare thatl the following is a full, clear, and exactdescription thereof, which will enable others skilled in the art'to makeand use the same, reference being had to the aecompanying drawings,forming part of this specification, in which- Figure 1 represents aninverted plan view of:4 my improved hoisting apparatus.

Figure 2 is a side view of the same partly in section, the plane ofsection being indicated by the linezz, fig. 1.

Similar letters of reference indicatev` corresponding parts.

This invention relates to a hoisting apparatusin which by an endlesschain motion is imparted to a shaft en which an endless screw isarranged which meshes into a worm-wheel that is mounted on anothershaft, The latter is'conneeted by differential gearing with two shafts,on which the drumsl over which the endless hoisting chain passes aremounted. l One of the drum-shaftscan be easily thrown out of gear forthe purpose of lower- -i-ng the hook pulley which slides in the lowerpart of thehoisting chain. The four shafts are hung in a casing which issuspended from a stationary frame, and which is provided with suitable.lids for giving access to the shafts for lubricating-and cleaningpurposes, Provision is made that the hoisting `chain cannot slip'on orget off the drum. i l i A represents acuse or box, made of sheet metalor other suitable marial, open at the under side, and closed on top tokeep the dust out. The central portion a of the cover is fixed between-the side pieces b of the case, while the ends c andl d of the cover arehinged to the centre a, their swinging ends resting upon the end piecese andf of the ease, respectively. To the top of the stationary cover aissecured a swivel hook, B, by whichv the case can be suspended from .astationary frame or beam. G is a shaft, which has its bearings in theend piecef, and in a plate, g, which is suspended' from the cover a. Onitsouter end is mounted alarge pulley, h, while its inner end isprovided with an endless screw, ,as is clearly shown the drawing. D, E,and F are three horizontal shafts, which have their bearings in the sidepieces b b of the case, and which are arranged on the same level witheach other, as is clearly shown in fig. 2. The shaft E is in the centrebetween D andF, whichare equally distant from it. A worm-wheel, j,ismounted on the shaft E, and meshes into the worm z. On each end of theshaft E is mounted a pinion, 7c, as is clearly shown in fig. 2.Thesepinions mesh into gear-wheels l and m that arev arranged ontheshsfts D and F, respectively. Motion is thus transmitted to theshafts D and F from the shaft C by means of an endless chain, G, 'whichpasses over the pulley h. The trans'- tnission is such that with littlepower applied to the shaft G, greatpowcr will be imparted to the shaftsD and F, so that heavy weights can be elevated with the-application ofbut a small amount of muscular power.' H is an endless hoisting chain,which is laid over two pulleys n and o, whichare mounted on the shafts DandF, respect` ively. This-chain is so arranged that two loops hang downfrom the case A, in one of which the hook pulley isarranged. The pulleysn and o have anges which are notched or recessed to receive and hold'the links of the chain H to prevent the same from slipping. By turningthe shaft C from-left to right, the shafts D and F will be revolved inthe direction of the arrows shown in g. 2, thereby drawing the ends ofthat loop in which the hook pulley is arranged up, and elevating theweight that may be suspended from the latter. The thread of'the screw z'is arranged so little inclined that when the parts are left unmoved theweight on the hook pulley will not be able to draw the loop of the chainin which it is arranged down again, the` flanges -of the screwz actingas effectual brakes to prevent the shaft E, and with it the shafts D andF, from turning. The pulleyh is also like the pulleys n and o, toprevent the chain G from slipping. The gear-wheel Z on the shaft Dismade so as to slide on vthe shaft, and is connected with a clutch, p,and lever g, the latter being pivoted to` the end strip c. By this meansthewhecl lean be thrown out of gear, whereby the shaft D is allowed toturn ,indepene dent of the other shafts.A Thus when' the shaft D isthrown out of gear, the hook pulley canbe easily andV quickly lowered,by drawing it down, so that the chain H will be drawn over the pulley onD, its other side p being held fixed on the shaft F. r r areZ-shapedarms, which aie secured to the case A, andere made tort aroundthe rim of the pulley lz'to prevent the chain from running out of thegroove. The pulleys n and o are protected in a similar manner by arms ss. Thepeculiur mode of drawing the chain H over the pulleys n and o, sothat both ends of the loop inA whichthe hook pulley hangs, are drawn `upat the same time, gives a greater -steadiness to the weight hoisted. L Lare four (more or less) plates orflugs, projecting from the sides of thecase A, and serve to support the latter when the same is not to besuspended. Boltsmay be arranged through these plates L, whereby thedevice may be secured on a suit-able bed of suiicient strength. rIhisarrangement- `will be of special value for elevating very heavyweights.'

Having thus described my invention, what I` claim as new, and desire tosecure by Letters Patent, is-

1. Soarranging theA hoisting chain andthe device for operating it, thattwo loops are suspended from the latter, in one of .which thehook-pulleyis arranged, the arms of this loop being laid over'pulleys ontwo shafts D and F, which are both revolved with exactly equal velocityand in the same direction, as set forth.

2. The Worm z' and vworm-wheel j, in combination with the shafts D, E,and F, and gear-wheels c,-Z, and m, all made and operating substantiallyas herein shown and described. i Y

-' 3. Providing the case A with folding lids o and d, substantially asand for the purpose herein shown and described'. l

' 4. The guards r and a, in combination with the grooved pulleys zand'nl o, respectively, for the purposes herein shownv and described.

5. The projecting lugs L L, when arranged on the'vcase A of ahoistingapparatus, substantially as and for tbs*- purposes herein shown anddescribed.

' WILLIAM- RUN G.

Witnesses:

WM. F, MCNAMARA, ALEX. F. ROBERTS.

